Air-Cooled Screw Compressor Liquid Chillersacare.eu/CarrierCD/Litt/13176_psd_01_2003.pdf · Carrier´s environmental leadership PRO-DIALOG Plus operator interface Carrier POWER The

30GX 50 Hz

Nominal cooling capacity 282-1203 kW

The 30GX units are air-cooled chillers, designed from the ground up to meet the needs of today and tomorrow:- ecological HFC-134a refrigerant- screw compressors- compact footprint- mechanically cleanable evaporatorAll units are equipped with PRO-DIALOG Plus control to optmize the efficiency of the refrigerant circuit, and with the revolutionary FLYING BIRD fan with rotating shroud. This innovative fan considerably reduces the air circulation noise and contributes to quiet unit operation. It is made of fully recyclable composite materials.

Features

Quality design and construction make the 30GX unit the preferred choice.

■

Non-controlled, ozone-benign HFC-134a refrigerant. HCF-134a is a proven, non-toxic, non-flammable refriger-ant which will have the highest usage of any new refriger-ant.

■

Medium-pressure refrigerant HFC-134a minimizes stress on the compressors and ensures their long operating life.

■

The 30GX units are equipped with screw compressors and with shrouded axial Flying Bird fans for extremely quiet operation and low-vibration levels.

■

The 30GX units exceed the efficiency level of average industry standards for both full- and part-load operation, saving on operating costs, through lower electrical costs.

■

The 30GX control is fully automatic. The leaving water temperature is continuously monitored to detect load and flow changes. This combination provides the most precise temperature control available.

■

Two independent refrigerant circuits - the second one takes over automatically, when the first one malfunctions, main-taining partial cooling under all circumstances.

■

Easy installation - the 30GX chillers are supplied with a full refrigerant charge, and conveniently located power supply and water inlet and outlet connections.

■

Auto-diagnostics - quick display of the machine status.

■

Multiple compressor concept for optimized part-load effi-ciency and minimized starting current.

■

Series star/delta starter, limiting the start-up current on 30GX 082-182 units.

Easy installation

■

The 30GX has a compact design that is up to 50% smaller than current chillers. The 30GX is supplied as a complete package for easy installation. There are no extra controls, timers, starters or other items to install.

■

30GX units have a single power point and one main discon-nect/isolator switch for sizes 30GX 082 to 182, and one power point and one main disconnect/isolator switch per circuit for sizes 30GX 207 to 358.The hydraulic connections are simple and facilitated by the use of Victaulic connections for the evaporator.

Carrier is participating in the Eurovent CertificationProgramme. Products are as listed in the EuroventDirectory of Certified Products.

Air-Cooled Screw Compressor Liquid Chillers

GLOBAL CHILLER

2

Simple to service

■

Mechanically-cleanable evaporator

■

Twin-screw compressors which require minimum routine service or maintenance.

■

Easily accessed suction and discharge pressure and temper-ature information via a display module.

PRO-DIALOG Plus control

PRO-DIALOG Plus is an advanced numeric control system that combines intelligence with great operating simplicity.

PRO-DIALOG Plus ensures intelligent leaving water temperature control and optimises energy require-ments.

■

The PID control algorithm with permanent compensation for the difference between the heat exchanger entering and leaving temperature, anticipates load variations, guarantees leaving water temperature stability and prevents unneces-sary compressor cycling.

■

The long-stroke electronic expansion valves (EXV), together with refrigerant level control via heat exchange in the evaporator, allows a significant energy efficiency improvement at part load conditions, and faultless chiller operation in a wider temperature range.

■

Adjustable ramp loading, according to the inertia of the application, avoids load increases that are too fast and too frequent, increasing unit life and limiting power consump-tion peaks.

■

Several capacity loading possibilities ensure improved start-up at low outdoor air temperature, and permit use of one of the refrigerant circuits as a back-up circuit.

PRO-DIALOG Plus ensures preventive protection and enhances chiller reliability.

■

Equalisation of compressor operating hours

■

No capillary tubes or pressostats (except as safety device)

■

PRO-DIALOG Plus monitors all chiller safety parameters. The fault history function and the fault codes facilitate immediate location of faults and in certain cases the condi-tions causing the alarm. Prognostic and preventive mainte-nance functions (incorrect water loop, oil filter dirty etc.) permit anticipation of possible problems.

PRO-DIALOG Plus offers extended communications capabilities

■

Clear and easy-to-understand operator interface. The LEDs, numeric displays and touch keys are well-positioned on the schematic chiller diagram. The user immediately knows all operating parameters: pressures, temperatures, operating hours, etc.

■

The extensive chiller remote control capabilities (wired connection) allow integration into building monitoring sys-tems (see Technical Description)

■

RS485 series port for connection to the Carrier Comfort Network (CCN) or any other monitoring system (optional communications interface with open protocol allows trans-fer of almost 40 parameters).

■

Parallel piloting of two units as standard, or of several units with Flotronic System Manager (FSM) and Chiller System Manager (CSM III) options.

■

The control permits:- Control in master/slave configuration of two units operat-

ing in parallel.- Programming of operating time schedules (up to 8 peri-

ods per week)- Programming of operating time schedules for the second

set point (up to 8 periods per week)- Definition of operating time period with demand limit.- Integration of the unit into a building monitoring system

(BMS): serial port RS 485.

■

Control of the customer’s water pump (dual pump with automatic configurable change-over).

■

Control at the second set point (example: room unoccu-pied).Set point reset as a function of the air temperature or the difference between entering and leaving water temperature.

Options and accessories

Option Accessory

Condenser anti-corrosion treatment for marine applications X

Condenser anti-corrosion treatment for medium marine and urban applications X

Condenser anti-corrosion treatment for heavy-duty rural, urban and industrial applications X

Copper/copper condenser coil X

Protection grilles X X

High and low pressure manometers X

Compressor suction valve X

Evaporator with one pass less X

Evaporator maximum water-side operating pressure of 21 bar X

Compressor and evaporator sound enclosure X

Unit with low noise level (field-installed vibration absorbing kit) X

Unit with very low noise level (option 15LN - combination of two previous options) X

Evaporator freeze-up protection X

Year-round operation for outside temperatures from 0°C to -18°C X

RS485 communications interface with open protocol X

Compressor soft start (30GX 207-358) - electronic starter X

Tropicalized control box X

Brine unit for leaving brine < +4°C and > -6°C X

Reversed evaporator water inlet/outlet X

Available fan pressure 150 Pa X

50% Heat reclaim X

Evaporator water pump starter X

Water connection kit (Victaulic flanges supplied) X

Carrier´s environmental leadership

PRO-DIALOG Plus operator interface

The 30GX is 20-50% smaller than the chillers it replacesCarrier POWER

3

twin-screw compressor

Low-noise FLYING BIRD axial fan with rotating shroud

Sound levels

30GX 082 092 102 112 122 132 152 162 182 207 227 247 267 298 328 358

Sound power, dB(A) 10

-12

WStandard units

99 99 99 99 100 100 101 101 101 102 103 103 103 104 104 104

Units with option 15LS

88 88 88 89 90 90 90 90 90 92 92 92 92 93 93 93

According to Eurovent 8/1 (derived from ISO standard 3744 and ISO 9614-1)

Physical data

* Standard Eurovent conditions: Evaporator entering/leaving water temperature 12°C and 7°C. Outdoor air temperature 35°C, evaporator fouling factor of 0.000044 m

2

K/W.Net cooling capacity = gross cooling capacity minus the capacity corresponding to the evaporator pressure drop (flow x drop/0.3).

** The weights shown are guidelines only. For the unit refrigerant charge please refer to the unit nameplate.

30GX 082 092 102 112 122 132 152 162 182 207 227 247 267 298 328 358

Net nominal cooling capacity*

kWStandard units 282 305 329 384 412 443 500 549 599 705 751 809 916 990 1116 1203Units with option 15LN 277 299 322 377 404 434 490 518 588 677 744 801 907 980 1083 1191

Operating weight

kgStandard units 3066 3097 3106 3350 3364 3378 3767 3783 4725 5520 5535 6121 6293 7339 7779 7950Units with option 15LN 3566 3597 3606 3922 3936 3950 4443 4459 5653 6462 6477 7191 7363 8521 9011 9288

Refrigerant charge**

HFC-134aCircuit A** kg 52 55 51 51 56 54 71 71 110 124 124 154 169 163 156 169Circuit B** kg 53 48 51 50 54 58 66 72 110 81 81 88 104 148 157 167

Compressors

Semi-hermetic, twin-screw POWER

3

Quantity - Circuit A 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2Quantity - Circuit B 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2Capacity control PRO-DIALOG Plus controlNo. of control steps 6 6 6 6 6 6 6 6 6 8 8 8 8 10 10 10Minimum step capacity % 19 21 19 21 19 21 19 21 21 16 14 14 14 9 10 10

Evaporator

Shell and tube with internally finned copper tubesNet water volume l 50 58 58 69 69 73 65 65 88 126 126 155 170 191 208 208Water connections Victaulic connectionsInlet/outlet in 4 4 4 5 5 5 5 5 5 6 6 6 6 8 8 8Drain and vent (NPT) in 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8Max. water side operating pressure kPa 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

Condensers

Copper tubes. aluminium finsCondenser fans Axial FLYING BIRD fan with a rotating shroudQuantity 4 4 4 6 6 6 8 8 8 10 10 12 12 14 16 16Fan speed r/s 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8 15.8

Total air flow

l/s 21380 21380 21380 32070 32070 32070 42760 42760 42760 53450 53450 64140 64140 74830 85520 85520

Physical data, water-cooled condenser for option 50

* Values based on a water velocity of 0.3 m/s for the closed loop and 0.9 m/s for the open loop.

30GX 082 092 102 112 122 132 152 162 207 227 247 298 328

Operating weight

kg 3466 3497 3506 3810 3824 3838 4247 4263 6100 6115 6701 8162 8602

Condenser

Tubular condenser with internally finned copper tubesWater volume l 24 24 24 32 32 32 39 39 62 62 62 69 74Water connections Factory-supplied flat flanges, to be welded on siteInlet and outlet in 2 1/2 2 1/2 2 1/2 3 3 3 3 3 4 4 4 4 4Drain and vent (NPT) in 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8Minimum flow rate, closed loop* l/s 1.3 1.3 1.3 1.6 1.6 1.6 2.1 2.1 3.7 3.7 3.7 4.1 4.5Minimum flow rate, open loop* l/s 4.0 4.0 4.0 4.9 4.9 4.9 6.4 6.4 11.0 11.0 11.0 12.2 13.4Maximum water-side operating pressure kPa 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

5

Electrical data

* Standard Eurovent conditions: Evaporator entering/leaving water temperature 12°C and 7°C. Outdoor air temperature 35°C.Nominal operating power input (compressors, fans, control) plus capacity corresponding to the evaporator pressure drop (flow x drop/0.3).

** Power input, compressor and fan, at unit operating limits (evaporator water entering/leaving temperature = 15°C/10°C, outdoor air temperature = 46°C) and a nominal voltage of 400 V (data given on the unit name plate).

*** Maximum unit operating current at maximum unit power input.**** Maximum instantaneous starting current (maximum operating current of the smallest compressor(s) + fan current + locked rotor current or reduced starting current of the largest compressor).

Fan electrical data = power input 2.4 kW and current draw 5.5 A per fan† Current and power inputs not included in the values above

N/A Not applicable

30GX 082 092 102 112 122 132 152 162 182 207 227 247 267 298 328 358

Power circuit

Nominal power supply V-ph-Hz 400-3-50Voltage range V 360-440

Control circuit supply

The control circuit is supplied via the factory-installed transformer

Nominal power input - standard unit*

kW 98 108 120 128 149 166 182 198 217 242 285 297 332 370 398 435

Nominal power input - option 15LN*

kW 99 110 123 130 151 172 185 201 220 248 287 299 329 373 405 447

Nominal current drawn*

A 170 188 206 220 256 290 313 340 373 413 478 498 547 621 675 744

Maximum power input**

kW 132 145 159 177 194 211 232 248 306 318 351 372 459 459 496 612Circuit A kW - - - - - - - - - 194 227 248 306 248 248 306Circuit B kW - - - - - - - - - 124 124 124 153 211 248 306

Maximum current drawn (Un - 10%)

A 248 272 295 331 361 391 433 463 564 593 653 695 847 854 926 1129Circuit A*** A - - - - - - - - - 361 421 463 564 463 463 564Circuit B*** A - - - - - - - - - 232 232 232 283 391 463 564

Maximum current drawn (Un)


Maximum starting current, standard unit**** (Un)


Max. starting current/max. current draw ratio, unit

1.51 1.46 1.51 1.45 1.43 1.40 1.50 1.47 1.32 2.48 2.75 2.64 2.34 2.34 2.23 2.00Max. starting current/max. current draw ratio, circuit A - - - - - - - - - 3.43 3.71 3.46 3.01 3.46 3.46 3.01Max. starting current/max. current draw ratio, circuit B - - - - - - - - - 5.93 5.93 5.93 5.01 3.25 3.46 3.01

Max. starting current - reduced current start**** (Un)

A std. std. std. std. std. std. std. std. std. 953 1015 1053 1195 1198 1264 1452Circuit A A std. std. std. std. std. std. std. std. std. 742 804 843 939 843 843 939Circuit B A std. std. std. std. std. std. std. std. std. 512 512 512 532 769 843 939

Max.starting current - red. current start/max. current draw ratio, unit

std. std. std. std. std. std. std. std. std. 1.77 1.71 1.67 1.55 1.54 1.50 1.41Circuit A std. std. std. std. std. std. std. std. std. 2.26 2.10 2.00 1.83 2.00 2.00 1.83Circuit B std. std. std. std. std. std. std. std. std. 2.43 2.43 2.43 2.07 2.16 2.00 1.83

Three-phase short-circuit holding current

kA 25 25 25 25 25 25 25 25 25 N/A N/A N/A N/A N/A N/A N/ACircuit A - - - - - - - - - 25 25 25 25 25 25 25Circuit B - - - - - - - - - 25 25 25 25 25 25 25

Standby capacity, unit or circuit A†

for evaporator water pump connections kW 4 4 4 5.5 5.5 5.5 7.5 7.5 7.5 7.5 9 9 9 15 15 15and for heat reclaim condenser pump kW 3 3 4 4 4 5.5 5.5 5.5 N/A 5.5 7.5 7.5 N/A 9 9 N/A

Electrical data notes:

• 30GX 082-182 units have a single power connection point; 30GX 207-358 units have two connection points.

• The control box includes the following standard features:- Starter and motor protection devices for each compressor and the fan(s)- Control devices

• Field connections:All connections to the system and the electrical installations must be in full accordance with all applicable local codes.

• The Carrier 30GX units are designed and built to ensure conformance with these codes. The recommendations of European standard EN 60 204-1 (corresponds to IEC 60204-1) (machine safety - electrical machine components - part 1: general regulations) are specifically taken into account, when designing the electrical equipment.

•

Electrical reserves:

Circuit A has disconnect switches and branch sections, designed to supply the evapora-tor pump power input.

NOTES:

• Generally the recommendations of IEC 60364 are accepted as compliance with the requirements of the installation directives. Conformance with EN 60 204 is the best means of ensuring compliance with the Machines Directive § 1.5.1.

• Annex B of EN 60204-1 describes the electrical characteristics used for the operation of the machines.

1.

The operating environment for the 30GX units is specified below:a. Environment* - Environment as classified in EN 60 721 (corresponds to IEC 60721):

- outdoor installation*- ambient temperature range: -18°C to +46°C, class 4K3*- altitude:

≤

2000 m*- presence of hard solids, class 4S2* (no significant dust present)- presence of corrosive and polluting substances, class 4C2 (negligible)- vibration and shock, class 4M2

b. Competence of personnel, class BA4* (trained personnel - IEC 60364)

2.

Power supply frequency variation: ± 2 Hz.

3.

The neutral (N) conductor must not be connected directly to the unit (if necessary use a transformer).

4.

Overcurrent protection of the power supply conductors is not provided with the unit.

5.

The factory-installed disconnect switch(es)/circuit breaker(s) is (are) of a type suitable for power interruption in accordance with EN 60947-3 (corresponds to IEC 60947-3).

6.

The units are designed for connection to TN networks (IEC 60364). For IT networks the earth connection must not be at the network earth. Provide a local earth, consult competent local organisations to complete the electrical installation.

NOTE:

If particular aspects of an actual installation do not conform to the conditions described above, or if there are other conditions which should be considered, always contact your local Carrier representative.

* The required protection level for this class is IP43BW (according to reference document IEC 60529). All 30GX units are protected to IP44CW and fulfil this protection condition.

0

-18

43

151174 ˚C

˚C

46

42

B

A

C

D - 45

Operating limits

Evaporator water flow rates

30GX

Minimum flow rate, l/s Maximum flow rate, l/s

082

5.2 20.8

092-102

6.5 25.9

112-132

7.4 29.6

152-162

9.4 37.8

182

11.5 45.9

207-227

14.1 56.3

247

16.3 65.2

267

18.3 73.4

298

20.9 83.7

328-358

23.0 91.9

Unit operating range at full load

Notes:

1. Evaporator

∆

T = 5 K2. If the ambient temperature can be below freezing, the evaporator must be protected

against frost.3. Available static pressure zero.A Standard unit operating at full load.B Standard unit operating at reduced load.C With year-round operation option.D Operating limit, 30GX 267 and 358 units at full load

Am

bien

t air

tem

pera

ture

, °C

Evaporator leaving water temperature, °C

7

Dimensions/clearances

30GX 082-182Standard units

500500

2297

1830

2254

1830

1

1 1

1

22

A

B

500500

1830

2254

1830

1

1 1

1

22

B

3

230

230

1351

1

2

3

Legend:

All dimensions are given in mm.

Required clearances for maintenance

Recommended space for tube removal, space can be either on the right or the left hand side.

Thickness of sound absorption kit

Water inlet

Water outlet

Power supply

Air outlet, do not obstruct

NOTE:

For a specific installation, consult the certified dimen-sional drawings, available on request.

30GX

A B

082-092-102

2967 1900

112-122-132

3425 1700

152-162

4340 2400

182

5994 1850

Units with low and very low sound levels

Dimensions/clearances

30GX 207-358Standard units

2297

A

500500

1830

1830

2254

B

1

11

1

2 2

1351

500500

230

2254

B

1

11

1

2 2

1830

230

1830

3

1

2

3

30GX

A B

207-227

5994 2850

247-267

6909 2850

298

7824 2050

328-358

8739 1150

Legend:




Thickness of sound absorption kit

Water inlet

Water outlet

Power supply


NOTE:

For a specific installation, consult the certified dimensional drawings, available on request.

Units with low and very low sound levels

2254

9

Dimensions/clearances – option 50

30GX 082-162

Legend:




Water inlet

Water outlet

Power supply


Option 50A:

∆

T = 10 KOption 50B:

∆

T = 5 K

NOTE:

For a specific installation, consult the certified dimensional drawings, available on request.

2297

1351

1830

1830

B

500

22541 1

1

2 2

9311

4.3

(4")

1

114.

3 (4

")

A

1

2

30GX

A B

082-092-102

3320 1900

112-122-132

3775 1700

152

4690 2400

162 4690 2400

Dimensions/clearances – option 5030GX 207-328

A

1351

168.

3 (6

")

500

2254

500

1830

1

1

1

1 22

1830

1351

B

1

2

Legend: All dimensions are given in mm.



Water inlet

Water outlet

Power supply


Option 50A: ∆T = 10 KOption 50B: ∆T = 5 K

NOTE: For a specific installation, consult the certified dimensional drawings, available on request.

30GX A B

207-227 5994 2850

247 6909 2850

298 7824 2050

328 8739 1150

11

Guide specificationsAir-cooled liquid chillerSize range: 282 to 1203 kW nominal capacityCarrier model number: 30GX

Part 1 - General 1.01 System description■ Microprocessor controlled, air-cooled liquid chiller utiliz-

ing HFC-134a, dual refrigeration circuits, screw compres-sors, and electronic expansion devices.

1.02 Quality assurance■ Unit shall be rated in accordance with Eurovent standard ■ Unit construction shall comply with European directives:

- Pressurised equipment directive (PED) 97/23/EC- Machinery directive 98/37/EC, modified- Low voltage directive 73/23/EEC, modified- Electromagnetic compatibility directive 89/336/EEC,

modified, and the applicable recommendations of Euro-pean standards:

- Machine safety: electrical equipment in machines, gene-ral regulations, EN 60204-1

- Electromagnetic emission EN 50081-2- Electromagnetic immunity EN 50082-2.

■ Unit shall be designed, manufactured and tested in a facil-ity with a quality assurance system certified ISO 9001.

■ Unit shall be manufactured in a facility with an environ-ment management system certified ISO 14001.

■ Unit shall be tested at the factory.

1.03 Delivery, storage and handling ■ Unit controls shall be capable of withstanding 55°C storage

temperatures in the control compartment.

Part 2 - Products2.01 Equipment■ General

Factory assembled, single-piece, air-cooled liquid chiller. Contained within the unit cabinet shall be all factory wir-ing, piping, controls, refrigerant charge (HFC-134a), required prior to field start-up.

■ Unit cabinet- Frame shall be made of U steel beam and protected by

three layers of paint.- The control box plates shall be steel with a oven-baked

polyester-paint finish, and be capable of withstanding a 500-hour salt spray test in accordance with the ASTM B-117 standard (U.S.A.).

■ Fans- Condenser fans shall be direct-driven, 11-blade, shrouded-

axial type, shall be statically and dynamically balanced, and made of recyclable material with inherent corrosion resistance. Air shall be discharged vertically upward.

- Fans shall be protected by coated steel wire safety guards.

■ Compressors- Unit shall have semi-hermetic twin-screw, gear-driven

compressors with internal muffler and check valve.- Each compressor shall be equipped with a discharge shut-

off valve.- Capacity control shall be provided by pilot-operated sole-

noid valve, capable of reducing unit capacity to 20% of full load. Compressor shall start in unloaded condition.

- Motor cooling shall be provided by direct liquid injec-tion and protected by internal overload thermistor.

- Lube oil system shall include pre-filter and internal filter capable of filtration to 3 microns.

■ EvaporatorUnit shall be equipped with a single evaporator- Evaporator shall be manufactured, tested and stamped in

accordance with the European directive for pressurised equipment 97/23/EC. The maximum refrigerant-side operating pressure will be 2500 kPa, and the maximum water-side pressure will be 1000 kPa.

- Shall be mechanically cleanable shell-and-tube type with removable heads.

- Tubes shall be internally-enhanced, seamless-copper type, and shall be rolled into tube sheets.Shall be equipped with Victaulic water connections (water connection kit on request).

- Shell shall be insulated with 19 mm closed-cell, polyvi-nyl-chloride foam with a maximum K factor of 0.28 and a mechanical aluminium protection.

- Shall incorporate two independent refrigerant circuits.- Shall have an evaporator drain and vent.- Shall incorporate a refrigerant level control system.

■ Condenser - Coil shall be air-cooled with integral subcooler, and shall

be constructed of aluminum fins mechanically bonded to internally finned copper tubes. The tubes are then cleaned, dehydrated, and sealed.

- Condenser coils shall be leak tested and shall be pressure tested at 3400 kPa.

- Condenser-fan motors shall be 3-phase type with perma-nently-lubricated bearings and Class F (minimum) insula-tion.

■ Refrigeration circuitsRefrigerant circuit components shall include oil separators, high and low side pressure relief devices (according to applicable standards), discharge and liquid line shutoff valves, filter driers, moisture indicating sight glasses, electronic expansion devices, refrigerant economizers (182, 267, 358 units), and complete operating charge of both refrigerant HFC-134a and compressor oil.

■ Controls, safeties, and diagnostics 1.Controls a. Unit controls shall include as a minimum: the micro-

processor, the LOCAL/OFF/REMOTE/CCN selector and a 6-digit diagnostic display (scroll-down text) with keypad.

b.Shall be capable of performing the following functions:- Automatic change-over between the main compressor

and the non-active compressor(s).- Capacity control based on leaving chilled fluid tempera-

ture with return fluid temperature sensing. - Limiting the chilled fluid temperature pull-down rate at

start-up to an adjustable range of 0.1°C to 1.1°C per minute to prevent excessive demand spikes at start-up.

- Enable adjustment of leaving chilled water temperature according to the return water temperature or the out-door temperature or (sensor supplied as standard) by means of a 0-10 V signal.

- Provide a dual set point for the leaving chilled water temperature activated by a remote contact closure sig-nal.

- Enable a 2-level demand limit control (between 0 and 100%), activated by a remote contact closure or a 0 to 10 V signal.

- Control evaporator water pump and, if installed, safety pump operation.

- Enable automatic changeover in the main phase or shut-down of two chillers in a single system.

- With two time scheduling programs enable unit start-up control and set-point change.

2.Diagnostics a. Display module shall be capable of displaying set points,

system status (including temperatures, pressures, current for each compressor, run time and percent loading), and any alarm or alert conditions.

b.The control shall allow a quick test of all machine ele-ments to verify the correct operation of every switch, cir-cuit breaker, contactor etc. before the chiller is started.

c. The control shall be capable of balancing the compressor operating times and the number of compressor start-ups.

d.EXV control, based on throttling (Carrier patent) opti-mises evaporator charging, ensuring condenser superheat and subcooling.

3.Safeties a. Unit shall be equipped with all necessary components,

and in conjunction with the control system shall provide the unit with protection against the following:- Loss of refrigerant charge.- Reverse rotation.- Low chilled water temperature.- Low oil pressure (per compressor).- Current imbalance.- Thermal overload.- High pressure. - Electrical overload.- Loss of phase.

b.Fan motors shall be individually protected by a circuit breaker

■ Control shall provide general alarm remote indication for each refrigeration circuit.

■ Control system shall have a RS485 serial output port (option and accessory).

■ Operating characteristics- Unit shall be capable of starting and running at full load

at outdoor ambient temperatures from 0°C to 46°C.- Unit shall be capable of starting up with 25°C entering

fluid temperature to the evaporator.

■ Electrical characteristics- Unit electrical power supply shall enter the unit at one

(30GX 082-182) or two locations.- Unit shall operate on 3-phase power supply without

neutral.- Unit with two compressors (30GX 082-182) shall have a

factory-installed, star-delta starter to limit electrical inrush current.

- Control voltage shall be supplied by a factory-installed transformer.

- Unit shall be supplied with factory-installed electrical disconnect switch/circuit breaker.

■ FinishingElectrical cabinet colour: RAL 7035Compressor/heat exchanger colour: RAL 7037

Manufactured by: Carrier SA, Montluel, France.Order No. 13176-20, 01 2003. Supersedes order No. 13176-20, 01.2002. Printed on Totally Chlorine Free Paper.Manufacturer reserves the right to change any product specifications without notice. Printed in the Netherlands.

Documents

Air-Cooled Screw Compressor Liquid Chillersacare.eu/CarrierCD/Litt/13176_psd_01_2003.pdf · Carrier´s environmental leadership PRO-DIALOG Plus operator interface Carrier POWER The